Danny, for we children of WWII vets frequently the best (and often the only) way to find, "anyone who knew my father" has been through unit veteran groups. I am not at all familiar with the 6th AD, or any vet group they (or the 9th Battalion) might have had, but a brief search of the Internet produced this site:
There you will see info which indicates the 6th AD had a vet association which, unfortunately, they apparently disbanded following their last reunion in 2000.
However, you will also see there info that might be of interest to you. When you get there, be sure to click the link, "Looking for information about a veteran?" Then click the link, "You know for a fact that the veteran served with the 6th Armored Division in WW II." At that link you will find some suggestions, including the following:
"This address routes your query to an informal network of people associated with the 6th Armored Division who MIGHT recognize the name and who MIGHT be able to respond to you.
Note: we are not some kind of personal research bureau and we have no access to government records and there is no master roster of everybody who served in the Division, and we can't tell you why your grandfather won his Bronze Star Medal. The best we can do is see if somebody recognizes the name and maybe (maybe) put you in touch with somebody who knew your serviceman.
Remember, something like 20,000 men had served with the Division by the time it was deactivated in 1945, and only a few hundred are still around in contact with each other. But we've had some good luck with previous queries."
Hope this helps you, Danny. Good luck with your search.